I need to look at two-byte pairs coming from a machine, and interpret the
meaning based on the relative values of the two bytes. In C I'd use a switch
statement. Python doesn't have such a branching statement. I have 21
comparisons to make, and that many if/elif/else statements is clunky and
inef
On 2006-01-08, Fredrik Lundh <[EMAIL PROTECTED]> wrote:
> DATA_MAP = {
> chr(32)+chr(32): 0,
> chr(36)+chr(32): "natural",
> ...
> chr(32)+chr(1): 5,
> chr(66)+chr(32): 0.167,
> }
> ...
> row_value = DATA_MAP[source.read(2)]
>
> # or: row_value = DATA_MAP.get(source.read(2), DE
Haven't found an answer to my question in the books and other docs I have
available, so I am asking here.
I have three lists of data retrieved from database tables. I want to cycle
through all three lists using nested FOR loops. What is the behavior if
there are no data in the list used in the
I'm stymied by what should be a simple Python task: accessing the value of
a variable assigned in one module from within a second module. I wonder if
someone here can help clarify my thinking. I've re-read Chapter 16 (Module
Basics) in Lutz and Ascher's "Learning Python" but it's not working for
On 2007-09-27, Steve Holden <[EMAIL PROTECTED]> wrote:
> Self-evidently you are *not* creating the variables you think you are in
> the variablePage module. Have you tried an interactive test? Try this at
> the interpreter prompt:
>
> >>> import variablePage
> >>> dir(variablePage)
>
> and you wil
My editor is emacs in linux, and I have the python mode enabled. The two
menus -- IM-Python and Python -- allow me to navigate within the loaded
module and open execute buffers, among other things. But, I don't see a way
to run a wxPython application from within the editor as I would from the
com
All my python books and references I find on the web have simplistic
examples of the IF conditional. A few also provide examples of multiple
conditions that are ANDed; e.g.,
if cond1:
if cond2:
do_something.
However, I cannot find, nor create by trial-and-er
On 2007-02-08, Paul Rubin wrote:
> [EMAIL PROTECTED] writes:
>> if cond1:
>> if cond2:
>> do_something.
>
> You can write:
>if cond1 and cond2:
> do_something
>
>> if cond1 OR if cond2:
>> do_something.
>
> if cond1 or cond2:
>do_something
>
>
I'm not sure how to change a string so that it matches another one.
My application (using wxPython and SQLite3 via pysqlite2) needs to compare
a string selected from the database into a list of tuples with another
string selected in a display widget.
An extract of the relevant code is:
While working with lists of tuples is probably very common, none of my
five Python books or a Google search tell me how to refer to specific items
in each tuple. I find references to sorting a list of tuples, but not
extracting tuples based on their content.
In my case, I have a list of 9 tupl
On 2007-02-25, Dennis Lee Bieber <[EMAIL PROTECTED]> wrote:
> Item is ALREADY the "current" tuple...
>
> for tpl in mainlist:
> if tpl[0] == "eco" and tpl[1] == "con":
> ec.Append(tpl[2:]) #presuming ec is NOT a list, as Append()
>
On 2007-02-25, Paddy <[EMAIL PROTECTED]> wrote:
> You might also use list comprehensions to accumulate the values you
> need:
>
> ec = [ item[2:] for item in mainlist if item[:2] == ['eco','con'] ]
Thank you, Paddy. That's the syntax I couldn't work out myself.
Rich
--
http://mail.python.or
On 2007-02-25, Jussi Salmela <[EMAIL PROTECTED]> wrote:
> I'm nitpicking, but the OP has a list of tuples:
> ec = [ item[2:] for item in mainlist if item[:2] == ('eco','con') ]
Jussi,
An excellent nit to pick.
Thank you,
Rich
--
http://mail.python.org/mailman/listinfo/python-list
I start with a list of tuples retrieved from a database table. These
tuples are extracted and put into individual lists. So I have lists that
look like this: [1, 2, 3, 4, 5]. When I concatenate lists, I end up with a
list of lists that looks like this: [[1, 2, 3. 4, 5]. [6, 7. 8, 9. 10]].
Then, I
On 2007-02-27, Leif K-Brooks <[EMAIL PROTECTED]> wrote:
Lief, Bjoern:
> l = l[0]
Of course! If I had let it work in my mind overnight I would almost
certainly have seen this.
Thank you both for your patient responses,
Rich
--
http://mail.python.org/mailman/listinfo/python-list
While it should be easy for me to get what I need from a list, it's
proving to be more difficult than I expected.
I start with this list:
[ 6.24249034e-01+0.j 5.11335982e-01+0.j 3.67333773e-01+0.j
3.01189122e-01+0.j 2.43449050e-01+0.j 1.82948476e-01+0.j
1.43655139e-01+0.j 9.9
On 2007-02-28, Robert Kern <[EMAIL PROTECTED]> wrote:
> No, that's a numpy array.
Robert,
That's where I went off. I forgot that I'm still dealing with a 1D NumPy
array and not a list. No wonder I had such fits!
> Those aren't tuples, but complex numbers.
I have not seen the 'j' suffix bef
I'm a bit embarrassed to have to ask for help on this, but I'm not finding
the solution in the docs I have here.
Data are assembled for writing to a database table. A representative tuple
looks like this:
('eco', "(u'Roads',)", 0.073969887301348305)
Pysqlite doesn't like the format of the mi
On 2007-02-28, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
import itertools
tuple(itertools.chain((t[0], t2[0].encode('ascii')), t[2:]))
> ('eco', 'Roads', 0.073969887301348305)
Steven,
As suggested in the previous article, I handled it where the values are
read from the list retrie
On 2007-02-10, [EMAIL PROTECTED] wrote:
> if item == selName:
Slicing doesn't seem to do anything -- if I've done it correctly. I
changed the above to read,
if item[2:-2] == selName:
but the output's the same.
Rich
--
http://mail.python.org/mailman/listinfo/python-list
On 2007-02-10, James Stroud <[EMAIL PROTECTED]> wrote:
> Assuming item is "(u'ground water',)"
>
> import re
> item = re.compile(r"\(u'([^']*)',\)").search(item).group(1)
James,
I solved the problem when some experimentation reminded me that 'item' is
a list index and not a string variable. by
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